docs: def get_parquet_lib(cls):
          """
          Find/choose a library to read and write Parquet files
          based on installed options.
          """
          if cls.__parquet_lib is None:
              parq_env = os.environ.get('QUILT_PARQUET_LIBRARY', ParquetLib.ARROW.value)
              cls.__parquet_lib = ParquetLib(parq_env)
          return cls.__parquet_lib